Go back to where you were before messing with the spindle drive and see if the control functions return.
The KTK is phase sensitive and needs the auxillary voltages to be in phase and at the correct voltage.
The control looks for a drive ready signal from the ktk.You can fake this.
If that then lets you run a programme you would also need to fake a spindle at speed signal too or it would fault out on "spindle not at speed" or similar.
When you first power the machine up the KTK should have three red leds lit.After referencing you should have four.